I think the name is good and without thinking it tells you what is does. Proposed `is_linter_available` is just not what is happening. The linter is always available, cuz it is implemented. If you want you can even run `pep8` on `js` files and still you will get the correct output - but does it make any sense ? That is why the name and functionality is to tell the user that "relevance" check is done here.